JPH0316876B2 - - Google Patents

Description

Detailed Description of the Invention 3-1 Purpose 3-1-1 Industrial Application Field The invention of this patent application (hereinafter simply referred to as the "present invention") is an overlock sewing machine equipped with a so-called free arm. In this method, a fabric previously sewn into a cylindrical shape is used to surround and support the throat plate up and down in the fabric feeding direction, including the free arm, and the fabric is cut close to the throat plate, arranged parallel to the fabric feeding direction, and moved up and down. This technology relates to the technique of overstitching the edges of a tube cloth while cutting them parallel to the cloth feeding direction with a knife (scalpel), especially for forming cuffs and hem openings of clothing. After sewing elastic knitted fabric into a tube shape in advance, a tube-shaped rubber knitted tube fabric with linear rubber knitted with an outer diameter smaller than the inner diameter is inserted into the inner surface of the end of the tube fabric. The present invention relates to a technique in which the inner diameters of both the inner diameter of the rubber cloth and the tube rubber cloth are expanded, and the edges of both hardened cloths are reliably trimmed parallel to the cloth feeding direction while overcasting is performed.

3-1-2 Conventional technology In a conventional overlock sewing machine, a flat cloth is cut and its edges are trimmed parallel to the cloth feeding direction, and the edges of the plain cloth cut by a chain stitch are overlocked. The system is structured and operates as follows.

(1) In other words, as shown in Fig. 1a, a plain cloth 2 (dotted chain line) is placed on the throat plate 1, and the feed dog groove 3 that passes through the throat plate 1 vertically, horizontally, vertically, The needle plate 1 is moved by the feed dog 4, which moves forward, and the presser foot (not shown), which is pressed by an elastic force on the feed dog 4. The needle drop hole 5 has a needle drop hole 5 in which a needle (not shown) moves up and down, which feeds and holds needle thread for forming a chain stitch in cooperation with a looper (not shown) provided below and operates, and a looper and a needle. The needle drop hole is made in cooperation with the needle drop hole 5 so that a chain stitch of a constant width is created in the horizontal orthogonal direction to the cloth feeding direction, and the chain stitch is continuously formed before the plain fabric 2 reaches the needle drop hole 5. A tongue piece 6 extends from 5 toward the cloth feeding direction, is inclined to become thinner, is horizontally orthogonal to the cloth feeding direction, and is provided on the same plane as the throat plate 1.
As shown in FIG. 1b, a lower knife 7 having a cutting blade 7a above which is parallel to the cloth feeding direction is provided on the same plane in the vertical direction as the throat plate 1 and extends vertically below the throat plate 1. Further, above the lower knife 7, a cutting blade 8a is provided below in conjunction with the drive mechanism of the sewing machine to move up and down on the upper surface of the throat plate 1 and slide parallel to the cutting section of the lower knife to shear the fabric. Since the upper knife 8 is acted upon by the cloth cutting mechanisms 7, 8, etc. by the extension part 8b extending vertically above and below the throat plate 1, the plain cloth 2 sent to the left by the feed dog 4 etc. in FIG. After the edge 2a of the plain fabric at the front in the cloth feeding direction reaches the upper and lower knives 7 and 8, the needle droplet hole 5 is sandwiched between the parallel cutting parts 7 and 8a of the upper and lower knives 7 and 8 of the plain fabric 2. The front edge 2b of the fabric on the opposite side is sheared and sent to the left, and chain stitches 9 are sequentially formed on the sheared edge 2C near the needle droplet 5, and then the fabric is sent to the left.

(2) In addition, after sewing a stretchable knitted fabric into a tube shape in advance, the soft tube fabric 10 (two-dot chain line) is expanded to the left and right in FIG. It is placed on the upper surface and expands laterally with its lower surface below the throat plate 1 to surround the upper, lower, left and right sides of the throat plate 1, and the upper knife 8 cuts the front edge 10a of the tube cloth in front of the upper knife 28. Even if an attempt is made to place it forward of the upper knife 8 in order to align it, the front edge 10a of the sleeve cloth becomes an obstacle because the extension 8a stands upright above and below the upper surface of the throat plate 1 in the vicinity of the extension 8a of the upper knife 8. Therefore, it is impossible to advance forward, but since the soft tube cloth 10 is flexible, the upper knife 8 can be moved forward as shown in FIG. 1a.
The recessed portions 10b are narrowed down diagonally in the vicinity of both left and right sides of the recessed portion 10b, and then, when the soft tube cloth 10 is rotated counterclockwise while being sent to the left by the operation of the feed dog 4, the recessed portion 10b on the right side is It rotates and moves to the left and is sheared by the cloth cutting mechanism, after which chain stitches 9 are sequentially formed in the vicinity of the needle droplet 5 similarly to the plain cloth 2.

(3) However, a cylindrical rubber knitted cylindrical fabric is made by sewing elastic knitted fabric into a cylindrical shape in advance, and then knitting linear rubber into the inner surface of the end of the cylindrical fabric with an outer diameter smaller than the inner diameter. Expand the double tube cloth 11 (three-dot chain line) inserted from the inside to the outside,
The upper surface of the double cylindrical cloth 11 is placed on the upper surface of the throat plate 1, and its lower surface is placed below the throat plate 1, expanding from side to side to surround the top, bottom, left and right sides of the throat plate 1, and the double cylindrical cloth 11
Even if an attempt is made to shear the front edge 11a of the double sleeve cloth 11 by the cloth cutting mechanisms 7 and 8, the front edge 11a of the double sleeve cloth 11 is cut off by the cylindrical stretchable knit fabric and the inner surface of the cylindrical rubber knit tube. Both the cloth and the cloth are harder than the flexible knit cloth due to tension and rubber properties due to expansion, so as shown in Figure 1a,
The front edge 11a of the sleeve cloth comes into contact with the part where the lower extension part 8b of the upper knife 8 stands upright on the upper surface of the throat plate 1 and cannot advance beyond that part (1,
As shown in 2), the front edge 11a of the double cylindrical fabric 11 cannot be sheared, and the chain seam 9 is formed on the uneven edge parallel to the fabric feeding direction, resulting in damage to the sewing material. The quality could not be avoided.

3-1-3 Problems to be Solved by the Invention The present invention has a front edge 11a of the double sleeve cloth 11, and a portion of the front edge 11a of the double sleeve cloth 11 in front of the cloth cutting mechanisms 7 and 8 in the cloth feeding direction is As in the case of stretchable knit fabric in (2), cut the cutting blades 7 and 8a of the upper and lower knives 7 and 8.
The double tube cloth 11 can be sheared at an angle toward
The purpose of the present invention is to solve the defect of the prior art described in item (3) above by expanding the front part in the cloth feeding direction so as to be wide at the front and narrow at the front.

3-2 Structure of the Invention 3-2-1 Means for Solving Problems Examples of the present invention will be described below with reference to the drawings.

(1) In the recent garment sewing industry, for winter clothing made from knitted fabrics such as training wear and pajamas, there are A cylindrical rubber knitted tube fabric made by knitting thin rubber threads parallel to the longitudinal direction is sewn with a protruding part.

To explain the process, first, as shown in Fig. 2, a- flat rectangular rubber-knitted plain cloth 12 is made into a cylinder with the back side 12a facing out, and b- the left and right edges are sewn to create a rubber-knitted tube. A cloth 13 is formed by c-folding it into the cylinder from the bottom to the top to form a double inner front 13b, an outer back 13a and the lower part is a folded part 13c and the upper part is a cut part 13d, while d-a stretchable knit cloth. Rubber knitted tube cloth 1 with a plain cloth such as
The cuffs and hem 14 are sewn into a cylindrical shape with an inner diameter larger than the inner diameter of the e-cuffs 14, and then the rubber knitted tube cloth 13 is cut into a portion 13d of the inner circumferential surface of the e-cuffs 14.
F-rubber knitted tube 1
3 from the inside in the left and right direction with the cuff 14, and insert it from the front to the front into the fixed arm 16 projecting toward the front of the overlock sewing machine 15 shown in FIG. , move only the movable arm 17 to the right and further move the front side thereof to the right to expand and support both cylinder cloths, and then open the cut 13 of both.
While accurately trimming d and 14a parallel to the left and right direction, oversewing both sheared edges together using chain seams 18, g-cuffs 14, rubber knitted tube fabric 1
3, after overlocking 18 the entire circumference of the cuts 14a and 13d, the overlock sewing machine 1
5 is fixed, the movable arms 16 and 17 are pulled out from the front to the front, and the rubber knitted sleeve cloth 13 and cuff 14 are reduced to their natural state. Seam 18 (cut 13
Using d and 14a) as fulcrums, turn it inside out to expose each side, and place the folded part 13c of the rubber knitted tube cloth 13 closer to the cuff 1 than the chain seam 18.
4, the rubber knitted sleeve cloth 13 and the cuffs 14 are both exposed on the outside, and the protruded rubber knitted sleeve cloth 13 can lightly surround the wrist when the body uses clothing such as training wear. Configure it as follows.

(2) In order to accomplish the work steps e to h in (1) above, the following mechanisms and devices will be used.

In Fig. 3, the right side of the overlock sewing machine 15 fixed to a table etc. is shown in Fig. 1a,
A protruding throat plate 1 as shown in FIG.
In front of the throat plate 1, a fixing arm 16, which is a so-called free arm having an arcuate corner in a cross section, is extended and fixed to the front.

A flat base 20 is horizontally fixed to a table or the like apart to the right of the overlock sewing machine 15.
A flat movable plate 21 is placed on the top surface of the base 20 so as to be movable back and forth and left and right. It is rotatably supported around a shaft 23 fixed upright at the left corner, and a movable arm 17 with a circular cross section is fixed to the left front of the rotating plate 22 so as to protrude toward the front and always be parallel to the free arm 16. And base 2
An air cylinder 24 whose piston rod is configured to move back and forth as air enters and exits is fixed to the front end of the top surface of 0 and connected to the front end edge of the movable plate 22.
3, an air cylinder 25 is fixed and connected to the right edge of the rotating plate 22, and an air cylinder 26 is attached to the right side of the shaft 23 in the left-right direction of the front edge of the rotating plate 22. Fix it.

3-2-2 Effects of the Invention Since the present invention has the above configuration, the following effects occur sequentially.

(1) As shown in Figure 2 e of the previous section 3-2-1, cuff 1
Rubber knitted tube cloth 13 is attached to the inner peripheral surface of 4 at its cut end 13d.
(2) As shown in FIG. 3, the air cylinder 24 on the base 20 is energized and the movable plate 21 is
At the same time, by moving the rotating plate 22 forward, the movable arm 17 is moved to the fixed arm 16.
The movable arm 17 is brought close to the fixed arm 16 and stopped by energizing the air cylinder 25 on the movable plate 21 and moving the rotary plate 22 to the left in conjunction with it. 3) Rubber knitted tube fabric 13 and cuffs 1 made by the process in the previous item (1)
4, the fixed arm 16 and the movable arm 17
Insert the rubber knitted tube cloth 13 from the front so that only the inner circumferential surface of the rubber knitted cloth 13 contacts it (Fig. 2 e). Move the moving arm 17 to the right, and fix it with the rubber knitted sleeve cloth 13. Move the moving arms 16 and 17 in parallel to the right so that the diameter is slightly larger than the natural inner diameter of the cuff 14. (5) Move the rubber knitted sleeve fabric 13 and cuff 14 forward, and cut each cut 1 in Figure 1 a and b.
3d and 14a are brought into contact with the extension part 8b of the upper knife 8, (6) the air cylinder 26 is energized, and in conjunction with this, the rotating body 22 is rotated counterclockwise around the shaft 23; The moving arm 17 is also connected to the axis 23
Since the rubber knitted sleeve cloth 13 and the cuff 14 are formed into a trapezoid that is wide at the front and narrow at the front, the rubber knitted sleeve cloth 13 and the cuff 14 are formed into a trapezoid that is wide at the front and narrow at the front.
4a is a slanted cut 2 extending diagonally further to the right of the extension part 8a of the upper knife 8 from that position.
7 (Fig. 2 f), and (7) press the vicinity of the needle drop hole 5 and the tooth feed groove 3 from top to bottom with elastic force using a cloth presser foot (not shown) to press both tube cloths together. After pressing it against the throat plate 1, the sewing machine starts to be driven, and (8) the replacement cloth for the rubber knitted tube cloth 13 and the cuff 14 moves to the left in FIG. Rotating clockwise, the inclined cut 27 is sequentially cut into the cutting blades 8 of the upper and lower knives 8, 7.
a, 7a, and are sequentially sheared in parallel to the cloth feeding direction. (9) Both sheared cylindrical cloths move to the left, and when the sheared cut reaches the needle drop hole, the sheared cut and needle drop An overlock stitch is formed by the chain stitch 9 with the width between the hole 5 and the needle, its thread, and the looper in cooperation with the tongue piece 6 (Fig. 2 f), (10) The double-tube fabric is After rotating and over-sewing the entire sheared cut, the sewing machine is stopped, (11) the air cylinder 26 is deenergized, the rotating plate 22 is rotated clockwise together with the moving arm, and the moving arm 17 is rotated. rotates clockwise, deenergizes the air cylinder 25, moves the rotary plate 22 to the left together with the movable arm, approaches the fixed arm 16, and deenergizes the air cylinder 25.
4 is deenergized and the movable plate 21 is moved forward to return the double-tube fabric that has been sewn from the expanded state to the naturally contracted state. Pull it out, and the end of the cuff 14 is the rubber knitted tube cloth 1
(13) Put the rubber knitted tube fabric 13 and cuff 14 together, turn them inside out using the overlock seam 18 (both shear cuts) as a fulcrum, and remove the front side of each. At the same time, the folded part 13c of the rubber knitted tube cloth 13 is made to protrude beyond the chain seam 18 to the side opposite to the cuff 14.

3-2-3 Other Examples The air cylinders 24, 25, 26, etc. can be replaced with solenoids or motors, especially pulse motors, etc. that utilize electromagnetism, and by converting electromagnetic force or the number of pulses, the air cylinders 24, 25, 26, etc. can be moved forward and backward of the moving plate 21. It is possible to adjust the moving distance, the horizontal moving distance of the rotating plate 22, and the rotating angle.

3-3 Effects of the Invention The present invention has the above-mentioned configuration and effects, and therefore has the following effects.

As described in (6 to 9) of the previous section 3-2-2, when the rubber knitted tube fabric 13 and the cuff 14 of the knitted fabric with polymerized rubber knitted fabric on the inner surface are expanded, due to the tension and the material of the rubber knitted fabric, Both tube cloths are cured, but the cut end of both tube cloths is inclined due to the rotation of the moving arm 17, and the cut end on the right side of the extension part 8a of the upper scalpel 8 has an inclination that extends diagonally further forward from that position. Cut 27
(FIG. 2 f), the inclined cut 27 is sequentially cut by the cutting blades 8 of the upper and lower knives 8, 7 by rotating the cloth feed.
a, 7a, and are sequentially sheared in parallel to the cloth feeding direction, so that the cut 13d of the rubber knitted tube cloth 13 and the cut 14a of the cuff 14 are reliably sheared and accurately in the cloth feeding direction. Since the line is parallel to the chain seam line 18, when the two cylinder fabrics are turned over to expose their surfaces to the outside as shown in Figure 2h, the chain seam line 18
The lines formed by the cuffs of the clothes are accurately aligned, and the cuffs of the clothes can have a beautiful appearance.

Further, in the present invention, when the movable arm 17 is parallel to and separated from the fixed arm 16, the movable arm 17 moves backward in a direction horizontally orthogonal to the cloth feeding direction (in the direction of approaching the throat plate 1), or is fixed. Since it is configured to move forward in the aforementioned direction (in the direction away from the throat plate) after approaching the arm, when retracting, the rubber knitted tube fabric 13 and the cuff 14, which are in a naturally contracted state before sewing, are fixed and moved. It can be inserted into the arm without frictional resistance and smoothly and closely supplied to the suturing mechanism of the needle droplet 5, and as the movable arm moves forward, the double-cylindrical fabric is released from expansion after sewing and returns to its natural contracted state. It is guided toward the front, and can be smoothly fixed and removed from the movable arm without frictional resistance, which also has the effect of improving the work efficiency of supplying and removing the double-tube fabric to and from the sewing machine suturing mechanism.

[Brief explanation of drawings]

Fig. 1a is a plan view of the throat plate 1 of the overlock sewing machine, and Fig. 1b is the same needle plate 1, upper and lower knives 8, 7 as above.
FIG. 2a is a side view showing the process of forming the rubber knitted sleeve cloth 13, FIG. 2b is a side view showing the process of inserting the rubber knitted sleeve cloth 13 into the cuff 14, sewing it, and turning it inside out. FIG. 3a is a plan view showing the configuration of the main movable arm 17, and FIG. 3b is a vertical sectional view of the same.

Claims (1)

[Scope of Claims] 1. Sequentially, the fabric tube is loosely fitted in a naturally contracted state with the front end surrounding the sewing mechanism of the sewing machine in a horizontal orthogonal direction to the fabric feeding direction in one straight line. , Expand the reverse cloth feed direction part in that direction parallel to the cloth feed direction part, make the reverse cloth feed direction part so that the front side forms a trapezoid that is wider than the front side, and rotate it in the reverse cloth feed direction with the front side as the center. Then, while feeding the fabric, shear the other end parallel to the fabric feeding direction, overlock the sheared edge, and contract the opposite fabric feeding direction part to the expanded state parallel to the fabric feeding direction part. , a method for shearing and sewing the edges of tube fabric, in which the reverse fabric feed direction section is reduced to a naturally contracted state. 2. A cloth presser foot that uses elasticity to press down the cloth toward the throat plate 1, a feed dog 4 that cooperates with the cloth presser foot to sandwich the cloth and send it to one side in a straight line, and an overstitch to the edge of the cloth at the needle droplet 5. a sewing mechanism, an upper knife 8 which is located in the reverse cloth feed direction than the needle drop hole and moves up and down so as to shear the cloth parallel to the cloth feed direction in cooperation with a lower knife 7 fixed below; and a needle. A fixed arm 16 protrudes from the plate toward the front horizontally and orthogonally to the cloth feeding direction and is fixed to the machine frame, and a fixed arm 16 is located in the opposite cloth feeding direction from the throat plate and is parallel to the fixed arm and horizontally orthogonal to the cloth feeding direction. It protrudes toward the front and is supported on the machine frame so that it can move forward and backward parallel to the fixed arm, move sideways, and rotate clockwise and counterclockwise centering on the end that is horizontally orthogonal to the cloth feeding direction. The movable arm 17 is supported on the machine frame so that the movable arm can be rotated back and forth and left and right, and drive bodies 24 and 2 are driven separately.
5, 26, and , the movable arm is sequentially moved backward relative to the fixed arm, then approached by moving to the left, moved away by moving to the right, and made the front side wider than the front by rotating in the reverse direction.
A device for shearing and sewing a sheared edge of a tube cloth, after overlocking the sheared edge of the tube cloth, the sewing machine moves parallel to each other by forward rotation, approaches by left rotation, and then moves forward.